Light shielding structure of a substrate for a liquid crystal device, liquid crystal device and projection type display device

a technology of liquid crystal devices and substrates, applied in static indicating devices, instruments, non-linear optics, etc., can solve problems such as leakage current to flow, leakage current generated by exposure of tft to stray light, and leakage current to aris
US6297862B1Inactive Publication Date: 2001-10-02SEIKO EPSON CORP
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Patents(United States)
Current Assignee / Owner
SEIKO EPSON CORP
Publication Date
2001-10-02
Estimated Expiration
Not applicable · inactive patent

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Abstract

Placement of a first light shielding film at least below the channel region of a TFT which drives a pixel, and of a second light shielding film above the same prevents impingement of light coming from above or from below on that channel region. Further, a second light shielding film is formed to cover the channel region and the first light shielding film, thereby to prevent the surface of the first light shielding film from direct exposure to light.
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Description

1. Field of the InventionThis invention relates to a technique which is suitably adapted for production of a substrate for a liquid crystal device, and a liquid crystal device and projection type display device based on the use thereof This invention relates more particularly to a light shielding structure of the substrate for the liquid crystal device which is used as a pixel switching element of a thin film transistor (to be abbreviated as TFT hereinafter).2. Description of Related ArtConventionally, a liquid crystal device is put into practice where pixel electrodes have been arranged in the form of a matrix on a glass substrate, and TFTs made of an amorphous silicon film or a polysilicon film have been prepared in correspondence with each pixel electrode, and which is so constructed as to drive a liquid crystal by applying a voltage through the TFT to each pixel electrode.Among such liquid crystal devices, one incorporating a polysilicon film of which it is possible to assemble ...

Claims

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